In short and a very simplistic description of what more ram does is, if you for ex. have half of ram what your motherboard have as maximum then the CPU's 100% max is only 50% of what it really can perform so basically more memory give the cpu more power to operate.
Maxing out the memory is actually more important to achieve max performance than maxing out the CPU frequency speed, something many do wrong to get it faster.

Yes it is very simplistic description and that is actually how it is, of course the cpu run at 100% but to achieve the maxed out performance it is going to use HDD swap mem for when that motherboards mem is not enough making it slower than it have to be, for HDD swap memory is never going to be as fast as the ram is so the more ram you got the more performance you get from the cpu.

Edit: if you put in 64GB of ram in your computer if that is untweeked max you would see some serious performance from your computer, so if you think it is fast now, try to max ram out and you will be surprised of how fast it become compared to what it is now.

Thank you all for taking the time to share and discuss what you know about this; it does sound to me like, although more is good when it comes to RAM, I should not expect miracles specifically in Raceroom coming out of the upgrade and that if, in example I want to see a faster screen that will go on to the refresh rate of the monitor and the power of the g card...

btw unless you really do memory intensive work with lots of data (thinking workstation like applications) there is no need for so much RAM. One benefits a bit from having more than needed to keep windows and background services happy, however most games will not make use of a lot of RAM, given they are written against lower limits, consoles... (even when they are 64-bit) and manage the streaming of data well.

There is no "magic" that makes an app use more RAM well. Hence SSD is typically best bang per buck (assuming you already have something like 8 GB RAM).

That's why you better have applications and usages that make use of that RAM, otherwise waste of money (especially going beyond 16 GB).

^^^^ What @pixeljetstream said. If you check benchmarks, sometime adding a ridiculous amount of ram will actually slow down performance. As long as you have the recommended amount of ram for a game (which means not caching from HDD), adding RAM beyond that will rarely if ever increase performance. I wish it did. Unfortunately we are not video editing here so there is no use.